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《Acta Sedimentologica Sinica》 2002-04
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The Sedimentary Characteristics of Simao Triassic Rear Arc Foreland Basin, Yunnan Province

TAN Fu wen (Chengdu Institute of Geology and Mineral Resources, Chengdu 610082)  
Simao basin locates in East part of Paleo Tethys tectonic zone. To its west is Lancangjiang orogenic belt and east is Ailao shan orogenic belt. Based on the late Paleozoic fold basement, Simao Triassic sedimentary basin formed in the early continental island arc colliusion stage after the close of Paleo Tethys ocean. Lots of viewpoints have been given to interpret its property, such as rear land basin, "delayed" back arc basin, rift basin and foreland basin. In this paper, the authors argue, on the basis of the study of the texture, property, stacking pattern, the provenance (or paleo current directions) of the deposits, the earth dynamics of the basin and the transfer mode of the basin center, that Simao Triassic basin was a rear arc foreland basin. Its development started before Anisian of Middle Triassic and controlled mainly by Lancangjiang orogenic belt. In Late Triassic, effected by Ailao shan orogenic belt, the basin had the properties of complex foreland basin. At the end of Triassic, it transformed into an intracontinental downwarped basin.
【Fund】: 中国石油天然气总公司南方新区油气勘探项目资助
【CateGory Index】: P512.2
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